Reamer



Feb. 24, 1931. N. L, HUFF 1,793,484

REAMER Filed NOV. 22 1927 INVENTOR ATTORNEYS j plements, commonly known as reamers, em-' ployed for finishing bearing and slmilar cyl-' ent invention is to providea new and efficient type of reamer which 15 effective for cuttlng Patented Feb. 2.4, 1931 NELSGN L. nuns, or airmen-n, messeonusnrrs Application filed November 22, 1927.] Serial u 255,552.

The object of-the presa' bearing surface, and which within limitations may be adj ust-ed to ream or finish holesof varying dimensions.

With this and other objects in view, the

various features of the invention consist in certain novel features of construction, combinations and arrangements of parts, hereinaft-er described and claimed, the advantages of which will be obvious to those skilledin the art from the following description.

In the accompanying drawings illustrating the preferred form of the invention,

Fig. 1 represents a top plan view of the improved reamer;

Fig. 2 is a side elevation of the reamer shown in Fig. 1;

lgig. 3 is a longitudinal section in elevation; an Fig. at is a cross-section of the reamer upon the line 13-13 of Fig. 2.

As indicated more particularly in the drawings, the reamer comprises essentially a steel bar 1 having a cutting portion and a shank portion 12 provided with a squared end 14 for the reception of an operating instrumentality. The cutting portion is provided with cutting edges 15 and 16 designed to engage and ream the interior of a cylindrical opening when the reamer is rotated therein. Cooperating with the cutting portion of the reamer for the purpose of maintaining the cutting edges in uniform cutting relation to the opening is a partially cylindrical shoe 2,

which, as indicated in the drawings, is mounted upon the steel-bar opposite the cutting edges 15 and 16. This shoe'is intended to maintain the cutting edges in true contact with the surface of the opening on rotation of the reamer, and facilitate the rotation within the opening. The present construction is so designed that by proper adjustment, the. cylindrical surface of the shoe may be caused to approach or recede from the cutting edges and within limits vary the effective diameter V ited in its scope to the type of the reamer, and in consequence adjust it for operating within openings or bearingsof varying dimensions. To this endfthe surface oftne 1 opposite the cutting edges 15; gradually tapered, as indicatedat 6, this tapered surface engaging'a' similarly pered surface-.18 formed upon the shoe 2; As indicated more particularlyinFig. 4:, the par tial cylindrical shoe is provided with longit'udinally inclined slot which causes the cy-' lindrical surface of the shoe to extend parallel to the cutting edges in any adjustedposijustedi through the provision of a threaded stem 3mounted in the shoe and extending through an opening formedin the upturned end 5 of the bar l- :Theste'm is located inadjnsted positionwith relation to the upturned end dbylock nuts t engaging with the stem upon opposite sides of the end, as willbe clearly evident-from the'drawings. It will be evident that, owingto the; provision of he 'adjustableI shoeTQ, the reamer I may be dapted for finishing hearings, or similar openings of varying dimensions within close limits, and that furthermore by substituting shoes having different diameters, the reamer may be adapted forvopenings having a considerable variation. For example, it has been found that with the type of reamer shown in the drawings, by substituting different shoes and by proper adjustment, a single reamer bar may be effectively employed for finishing openings varying from to inch in diameter. It will be evident that the ad justable shoe 2, as shown in preferably made of Wood. This is desirable as the wooden shoes may be easily made and tion thereof. The shoe 2 is conveniently 'adfrom one end, the stem projecting loosely,

the drawings, is

replaced, and furthermore this type of shoe that the shoe may be made of any suitable material, and that the invention is not limof shoe illustrated in the drawing.

What is claimed is:

1. A reamer comprising an elongated bar having four surfaces providing a generally rectangular cross section of the bar, cutting asimilarlyinclined longitudinal slot for en- I i at thecutting end of the bar for adjusto edges formed on one surface of the bar within the cutting region, the surface of the bar 7 opposite the cutting surface being provided with a gradual taper, and a cylindrical guide shoe extending throughout the major portion of the tapered surface, having a similarly inclined longitudinal .slot'for engagement with,

the tapered surface of the bar, the guideshoe completely surrounding the tapered surface and the major portion of the two side surfaces but allowing the cutting edges to protrude, whereby longitudinal adjustment of the guide shoe with relation tothe cutting bar increases or diminishes the eifective diameter of the reamer without alteration of its cylindrical characteristics v 2.,A reamer ,comprisingan elongated'bar having four surfaces providing a generally rectangular cross-section of the bar, cutting edges formed on onesurface of the bar within the cutting region, the surface'of the bar opposite. the cutting surface being provided with :a gradualtaper, a cylindrical and nonmetallic guide 'shoe extending throughout the major port-ion of the tapered surface having gagement with the tapered surface of the bar, the guide shoe completely surrounding the tapered surface and the major portion of the two side surfaces but allowing the cutting edges to protrude, and means ing the guide ,shoe longitudinally thereof, whereby longitudinal adjustment of the guide shoe with relation to the cutting bar increases or diminishes the effective diameter of the reamer without alteration of its cylindrical characteristics.

NELSON L. HUFF. 

